panic: timeout_add: to_ticks (-1299514201) < 0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *137210 79352 0 0x1000 0x4080000 0K syz-executor.0 410646 79352 0 0x1000 0x4080000 1 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399 panic() at panic+0x174 sys/kern/subr_prf.c:208 timeout_add(ffff80000066d060,b28afca7) at timeout_add+0x194 sys/kern/kern_timeout.c:190 pcppi_bell(ffff80000066d000,fa8d3987,b28afca7,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800020c57350,46,ffff800020b439e0) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800020c57350,46,ffff800020b439e0) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd807e5805e8,20005302,ffff800020c57350,46,fffffd807f7c7c00,ffff800020b439e0) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd80671a9c00,20005302,ffff800020c57350,ffff800020b439e0) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b439e0,ffff800020c57498,ffff800020c57480) at sys_ioctl+0x646 syscall(ffff800020c57530) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c57530) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff88,0,3,dff73315010) at Xsyscall+0x128 end of kernel end trace frame: 0xe0179a0d540, count: 5 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic timeout_add: to_ticks (-1299514201) < 0 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399 panic() at panic+0x174 sys/kern/subr_prf.c:208 timeout_add(ffff80000066d060,b28afca7) at timeout_add+0x194 sys/kern/kern_timeout.c:190 pcppi_bell(ffff80000066d000,fa8d3987,b28afca7,1) at pcppi_bell+0x2a0 sys/dev/isa/pcppi.c:234 spkrioctl(1b00,20005302,ffff800020c57350,46,ffff800020b439e0) at spkrioctl+0x230 tone sys/dev/isa/spkr.c:89 [inline] spkrioctl(1b00,20005302,ffff800020c57350,46,ffff800020b439e0) at spkrioctl+0x230 sys/dev/isa/spkr.c:503 VOP_IOCTL(fffffd807e5805e8,20005302,ffff800020c57350,46,fffffd807f7c7c00,ffff800020b439e0) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd80671a9c00,20005302,ffff800020c57350,ffff800020b439e0) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b439e0,ffff800020c57498,ffff800020c57480) at sys_ioctl+0x646 syscall(ffff800020c57530) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c57530) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff88,0,3,dff73315010) at Xsyscall+0x128 end of kernel end trace frame: 0xe0179a0d540, count: -10 ddb{0}> show registers rdi 0xffffffff812c7447 db_enter+0x17 rsi 0x16ff __ALIGN_SIZE+0x6ff rbp 0xffff800020c56f70 rbx 0xffff800020c57020 rdx 0x1700 __ALIGN_SIZE+0x700 rcx 0xffff800000947000 rax 0xffff800000947000 r8 0xffffffff8155ffb3 kprintf+0x183 r9 0x1 r10 0x25 r11 0x15a0c3810bddd927 r12 0x3000000008 r13 0xffff800020c56f80 r14 0x100 r15 0x1 rip 0xffffffff812c7448 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c56f60 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=137210 stat=onproc flags process=1000 proc=4080000 pri=21, usrpri=77, nice=20 forw=0xffffffffffffffff, list=0xffff800020b42bd0,0xffff800020b42028 process=0xffff800020b44010 user=0xffff800020c52000, vmspace=0xfffffd807efff708 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 79352 203419 58059 0 3 0x3000 suspend syz-executor.0 *79352 137210 58059 0 7 0x4081000 syz-executor.0 79352 410646 58059 0 7 0x4081000 syz-executor.0 79352 417572 58059 0 2 0x4081080 syz-executor.0 58480 470521 36599 0 3 0x80 fsleep syz-executor.1 58480 222840 36599 0 3 0x4000080 ttyout syz-executor.1 49797 501561 0 0 3 0x14200 bored sosplice 36599 77725 3385 0 3 0x82 nanosleep syz-executor.1 58059 199544 3385 0 3 0x82 nanosleep syz-executor.0 3385 392504 46628 0 3 0x82 thrsleep syz-fuzzer 3385 305917 46628 0 3 0x4000082 thrsleep syz-fuzzer 3385 421732 46628 0 3 0x4000082 thrsleep syz-fuzzer 3385 75815 46628 0 3 0x4000082 kqread syz-fuzzer 3385 305390 46628 0 3 0x4000082 thrsleep syz-fuzzer 3385 217871 46628 0 3 0x4000082 thrsleep syz-fuzzer 3385 244572 46628 0 3 0x4000082 thrsleep syz-fuzzer 3385 198801 46628 0 3 0x4000082 thrsleep syz-fuzzer 3385 209346 46628 0 3 0x4000082 thrsleep syz-fuzzer 3385 144880 46628 0 3 0x4000082 thrsleep syz-fuzzer 46628 109668 26777 0 3 0x10008a pause ksh 26777 469855 62694 0 3 0x92 select sshd 66443 292228 1 0 3 0x100083 ttyin getty 62694 18829 1 0 3 0x80 select sshd 24374 28852 65823 73 3 0x100090 kqread syslogd 65823 317569 1 0 3 0x100082 netio syslogd 32026 118919 1 77 3 0x100090 poll dhclient 73589 52469 1 0 3 0x80 poll dhclient 33966 464150 0 0 3 0x14200 pgzero zerothread 84452 31987 0 0 3 0x14200 aiodoned aiodoned 52821 464389 0 0 3 0x14200 syncer update 97299 258262 0 0 3 0x14200 cleaner cleaner 59518 515049 0 0 3 0x14200 reaper reaper 63568 123178 0 0 3 0x14200 pgdaemon pagedaemon 28538 301395 0 0 3 0x14200 bored crynlk 44654 212152 0 0 3 0x14200 bored crypto 63401 4710 0 0 3 0x40014200 acpi0 acpi0 1413 70129 0 0 3 0x40014200 idle1 368 28463 0 0 3 0x14200 bored softnet 64848 7712 0 0 3 0x14200 bored systqmp 3422 455301 0 0 3 0x14200 bored systq 45130 384678 0 0 3 0x40014200 bored softclock 13858 394919 0 0 3 0x40014200 idle0 1 145699 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 79352 (syz-executor.0) thread 0xffff800020b439e0 (137210) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8230eba0) locked @ /syzkaller/managers/multicore/kernel/sys/kern/sched_bsd.c:436 #0 witness_lock+0x58a sys/kern/subr_witness.c:1205 #1 ___mp_acquire_count+0x67 sys/kern/kern_lock.c:231 #2 mi_switch+0x3b0 sys/kern/sched_bsd.c:436 #3 sleep_finish+0x110 sys/kern/kern_synch.c:312 #4 sleep_finish_all+0x34 sleep_finish_timeout sys/kern/kern_synch.c:336 [inline] #4 sleep_finish_all+0x34 sys/kern/kern_synch.c:157 #5 tsleep+0x1bc #6 spkrioctl+0x261 rest sys/dev/isa/spkr.c:106 [inline] #6 spkrioctl+0x261 sys/dev/isa/spkr.c:501 #7 VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 #8 vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 #9 sys_ioctl+0x646 #10 syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] #10 syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 #11 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9500 6343K 6351K 78643K 11049 0 0 pcb 23 9K 11K 78643K 489 0 0 rtable 100 3K 4K 78643K 262 0 0 ifaddr 49 12K 12K 78643K 102 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 22 0 0 iov 0 0K 24K 78643K 111 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1201 75K 76K 78643K 2100 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 5K 78643K 16 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 1K 1K 78643K 117 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1792 194K 288K 78643K 12592 0 0 file desc 6 17K 25K 78643K 1247 0 0 sigio 0 0K 0K 78643K 11 0 0 proc 41 38K 58K 78643K 410 0 0 subproc 64 65538K 67586K 78643K 72 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 ip_moptions 0 0K 0K 78643K 96 0 0 in_multi 33 2K 2K 78643K 49 0 0 ether_multi 1 0K 0K 78643K 4 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 72 318K 318K 78643K 72 0 0 exec 0 0K 1K 78643K 222 0 0 pfkey data 0 0K 4K 78643K 2 0 0 pagedep 1 8K 8K 78643K 1 0 0 inodedep 1 32K 32K 78643K 1 0 0 newblk 1 0K 0K 78643K 1 0 0 VM swap 7 26K 26K 78643K 7 0 0 UVM amap 93 21K 31K 78643K 4734 0 0 UVM aobj 38 2K 2K 78643K 43 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 0 0K 0K 78643K 52 0 0 NDP 9 0K 0K 78643K 27 0 0 temp 148 2366K 2433K 78643K 5739 0 0 kqueue 0 0K 0K 78643K 9 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 4 0 0 1 0 1 1 0 8 0 inpcbpl 280 419 0 412 1 0 1 1 0 8 0 plimitpl 152 27 0 20 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtentry 112 41 0 1 2 0 2 2 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpcb 544 152 0 148 1 0 1 1 0 8 0 nd6 48 4 0 0 1 0 1 1 0 8 0 ppxss 1128 9 0 9 7 7 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 185 0 0 12 0 12 12 0 8 0 art_table 32 186 0 0 2 0 2 2 0 8 0 art_node 16 40 0 6 1 0 1 1 0 8 0 sysvmsgpl 40 24 0 11 1 0 1 1 0 8 0 semapl 112 115 0 105 1 0 1 1 0 8 0 shmpl 112 41 0 5 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 4266 0 2852 46 0 46 46 0 8 0 ffsino 272 4266 0 2852 97 2 95 95 0 8 0 nchpl 144 6101 0 4477 61 0 61 61 0 8 0 uvmvnodes 72 4383 0 0 80 0 80 80 0 8 0 vnodes 200 4383 0 0 231 0 231 231 0 8 0 namei 1024 16681 0 16681 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 15921 0 15921 10 9 1 6 0 8 1 sigapl 432 1415 0 1401 2 0 2 2 0 8 0 futexpl 56 11508 0 11506 1 0 1 1 0 8 0 knotepl 112 202 0 175 3 2 1 2 0 8 0 kqueuepl 104 211 0 209 1 0 1 1 0 8 0 pipepl 112 730 0 711 3 2 1 2 0 8 0 fdescpl 488 1416 0 1401 3 1 2 3 0 8 0 filepl 152 7261 0 7164 10 6 4 5 0 8 0 lockfpl 104 868 0 868 2 1 1 1 0 8 1 lockfspl 32 607 0 607 2 1 1 1 0 8 1 sessionpl 112 17 0 7 1 0 1 1 0 8 0 pgrppl 48 24 0 14 1 0 1 1 0 8 0 ucredpl 96 1585 0 1578 1 0 1 1 0 8 0 zombiepl 144 1401 0 1401 2 1 1 1 0 8 1 processpl 840 1431 0 1401 4 0 4 4 0 8 0 procpl 600 4116 0 4073 4 0 4 4 0 8 0 sosppl 128 15 0 15 6 5 1 1 0 8 1 sockpl 384 839 0 822 9 6 3 4 0 8 1 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 10 0 0 1 0 1 1 0 8 0 mcl9k 9216 7 0 0 1 0 1 1 0 8 0 mcl8k 8192 7 0 0 1 0 1 1 0 8 0 mcl4k 4096 12 0 0 2 0 2 2 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 122 0 0 14 0 14 14 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 169 0 0 8 0 8 8 0 8 0 bufpl 256 7608 0 1014 413 0 413 413 0 8 0 anonpl 16 122372 0 114498 87 38 49 49 0 125 17 amapchunkpl 152 7639 0 7544 13 8 5 11 0 158 1 amappl16 192 7317 0 6901 62 33 29 33 0 8 8 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 11 0 7 2 1 1 1 0 8 0 amappl13 168 25 0 22 1 0 1 1 0 8 0 amappl12 160 12 0 10 2 1 1 1 0 8 0 amappl11 152 653 0 642 1 0 1 1 0 8 0 amappl10 144 53 0 52 2 1 1 1 0 8 0 amappl9 136 822 0 818 1 0 1 1 0 8 0 amappl8 128 143 0 122 1 0 1 1 0 8 0 amappl7 120 38 0 32 1 0 1 1 0 8 0 amappl6 112 54 0 46 1 0 1 1 0 8 0 amappl5 104 125 0 113 1 0 1 1 0 8 0 amappl4 96 1021 0 996 2 1 1 2 0 8 0 amappl3 88 200 0 194 1 0 1 1 0 8 0 amappl2 80 12885 0 12822 2 0 2 2 0 8 0 amappl1 72 37668 0 37223 24 14 10 19 0 8 0 amappl 72 4332 0 4294 1 0 1 1 0 75 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma64 64 259 0 259 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 17 0 17 1 1 0 1 0 8 0 aobjpl 64 42 0 5 1 0 1 1 0 8 0 uaddrrnd 24 1416 0 1401 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1416 0 1401 1 0 1 1 0 8 0 vmmpekpl 168 15277 0 15254 2 0 2 2 0 8 0 vmmpepl 168 150516 0 149053 118 43 75 75 0 357 11 vmsppl 360 1415 0 1401 2 0 2 2 0 8 0 pdppl 4096 2840 0 2802 6 1 5 6 0 8 0 pvpl 32 371302 0 360349 212 86 126 126 0 265 37 pmappl 224 1415 0 1401 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 564 0 6 16 0 16 16 0 8 0